Frank f



F. F. BURTON AND A. F. LAUDENSACK.

REAR SIGHT FOR HREARMS.

APPLICATION` FILED r11/111.31, 1919.

1 ,321,508. Patented Nov. 11, 1919.

UNITED STATES PATENT OFFICE.

FRANK F. BURTON, OF MOUNT CARMEL, AND ALBERT F. LAUDENSACK, OF NEW HAVEN, CONNECTICUT, ASSIGNORS T0 WINCHESTER REPEATING AIR/MSr CO., OF NEW HAVEN,

CONNECTICUT, A CORPORATION.

REAR SIGHT FOR FIREARMS.

Patented Nov. 11, 1919.

Application led March 31, 1919. Serial No. 286,510.

To all whom z' may concern:

Be it known that we, FRANK F. BURTON and ALBERT F. LAUDENsAcK, citizens of the United States, residing, respectively, at Mount Carmel and at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Rear Sights for Firearms; and we do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to vbe a full, clear, and exact description of the same, and which said drawings constitute pait of this application, and represent, iii- Figure 1 a view in side elevation of our improved sight shown as applied to thereceiver of the arm, portions of the receiver being broken away, and the sight-leaf being shown in its elevated position.

Fig. 2 a view of the device in rear elevation with the receiver in vertical transverse section.

Fig. 3 a view thereof in central vertical longitudinal section with the sight-leaf depressed,

Fig. 4 a detached plan view with the sightleaf removed.

Fig. 5 an enlarged broken detail view in vertical section of the upper left hand c or- `ner of the sight-leaf showing the locking of the elevation-screw by the entrance of a spring into one of the notches of its head.

Fig. 6 a detached plan view of the notched head of the elevation screw.

Fig. 7 a view of the sight-leaf in transverse section on the line 7-7 of Fig. 2.

Fig. 8 a detached brok-en view partly in plan, and partly in horizontal section, showing the engagement yof the opposing windage-screws with the opposite faces of a tongue extending rearwardly from the pivotal sight-base.

Fig. 9 a detached broken sectional view on the line 9 9 of Fig. 4.

Fig. 10 a detached plan view of one of the windage-screws.

Fig. 11 a view thereof in inside elevation showing its notched inner face.

Fig. 12 a detached view in elevation of one of the windage-screw locking-springs.

Fig. 13 a rear view thereof.

Fig. 14 a plan view thereof.

Our invention relates to an improvement in rear sights for firearms, the object being to produce a sight of increased accuracy and positiveness of adjustment, and constructed with particular reference to adjustment by the tactile as well as the visual sense.

l/Vitli these ends in view, our invention consists in a rear sight for firearms, having certain details of construction and combination of parts as will be hereinafter described and pointed out in the claims.-

In carrying out our invention as herein shown, a centrally arranged adjustingtongue 10 is formed upon the rounded rear edge 11 of the upper or pivotal sight-base 12, the forward end of which is provided with a heavy pivot 13 entering a pivot-hole i 14 in the fixed sight-base 15 which is furnished with a transverse under-cut fastening rib 1G entering a transverse dovetail slot 17 in the upper face of the receiver 18 which may be of any ordinary construction.

Near its rear end the pivotal sight-base 12 is formed with a pair of upstanding lugs 19 receiving a pin 20 also passing through the sight-leaf 21 which is held in its elevated position as shown in Figs. l and 2, and in its depressed position as shown in Fig. 3 by means of a leaf spring 22 engaging with its pivoted end, the said spring 22 being set into a recess 23 in the pivotal sightbase 12 as shown in Fig. 4, and secured in place at its forward end in any convenient manner.

The tongue 10 constituting one of the salient features of our present invention, has its opposite faces normally engaged by two complementary opposed windage-screws 24 respectively inserted into the opposite ends of an upstaiiding screw hole 25 formed in a shoulder 26 located at the rear end of the fixed sight-base 15. The forward wall of the screw hole 25 is cut away throughout the length thereof to form a lateral 'opening 27 for the reception of the tongue 10, whereby the saine is entered between the inner ends of the windage-screws 24, 24, as shown in Fig. S. The forward upper edge 28 of the shoulder 26 overhangs the upper face of the tongue 10 in position to confine the same, and hence the pivotal sight-base, 105

The edge 28 is furnished with a scale 31 coacting with an index-mark 32 upon the sight-base 12.

For locking the windage screws 24 in their adjusted positions, the inner faces of their knurled heads 33 are formed with radial locking-notches` 34 receiving projections 35 struck outward from the upper edges of outwardly inclined arms 36 upstanding from the outer ends of flat sliding springs 37 inserted into a shallow slot 38 (Fig. 3) formed in the receiver at a point directly under the rear end of the fixed sight-base 15. The said upstanding arms of the springs are formed with clearance openings 39 for the passage through them of the respective screws 24. rlhe said arms are outwardly inclined as stated and as shown in Figs. 13 and 14, so

that when the device is assembled, they will produce constant outward pressure upon the notched inner farces of the screw heads 33.

For coupling the springs with the screws so that they may travel together, the latter are formed with integral collars 40 separated from the inner faces of the screw-heads 33 by narrow spaces 41, the clearance openings 39 in the arms 36 of the springs being large enough to clear the said collars 40 of the screws' when the device is being assembled. To permit the springs to aline with the screws, the lower edges of the holes 39 are notched as shown at 42, whereby when the device is assembled the notches 42 rise into the coupling spaces 41 so that as the screws are turned inward and outward, the spring aline with and follow them. f

For adjusting the slide 43 upon the lea 21 for elevation, we employ an elevationscrew 44 which is located between the front and rear faces of the leaf and provided at its upper end with a head 45 the edge of which is formed with a regularly spaced series of notches 46 receiving` the end of a locking-spring 47 set into a long narrow slot 48 in the left hand edge of the leaf 21 as shown in Figs. 2 and 5. The slide 43 mounts a plate 49 and has a sight-opening 50. A graduated scale 51 upon the right hand side of the leaf 21 coperates with an index-mark 52 intersecting the sight-opening 50.

In the use of our improved device, the opposed screws 24 normally engage with the opposite faces of the tongue 10 and hold the base 12 against any possible swinging movement in either direction. When it is desired to adjust the sight for windage, one screw is retired and the other correspondingly advanced. The turning of the screws is gaged by the clicking of the springs in the lockingnotches of their heads, whereby the user of the sight is enabled to adjust it by the sense of hearing and feeling rather than by sight, if he so desires. In other words, he is not obliged to take his eyes off the target in order to adjust the sight. By employing two opposed windage screws, we entirely eliminate the back-lash or slack necessarily present in sights employing a single adjusting screw. To adjust the sight for windage, the user of the arm without removing his eyes from the target, turns the elevation-screw 44 in one direction or the other, thus raising and lowering the slide 43. He is guided in this adjustment by the clicking of the spring 47` in the notches 46 of the screw-head 45.

Ve claim 1. A rear sight for firearms having a lower base, an upper base pivotally mounted thereupon, and two windage thumb-screws mounted in the said lower base and acting in opposition to each other upon the said upper base for the windage adjustment thereof.

2. A rear sight for firearms having a lower base, an upper base pivotally mounted thereupon at the forward end thereof, and two opposed windage thumb-screws mounted in the rear end of the said lower base and coacting with the rear end of the said upper base for the windage adjustment thereof.

3. A rear sight for rearms having a lower base formed with a transverse screwhole with a: lateral opening inn its forward wall, of an upper base pivotally mounted upon the lower base and furnished at its rear end with a tongue entering the said screwhole through the said lateral opening, and two windage thumb-screws entering the opposite ends of the said screw-hole and engaging with the said tongue on opposite sides thereof for the windage adjustment of the sight.

4. In a rear sight for firearms, the combination with a lower base provided at its rear end with an upstanding shoulder having a transverse screw-hole with a lateral opening in its forward wall, of an upperbase pivotally mounted upon the said lower base and formed at its rear end with a tongue entering the said screw-hole through the said lateral opening, and two opposed windage thumb-screws entering the opposite ends of the said screw-hole and co-acting with the said tongue on opposite sides thereof thereof for the windage adjustment of the sight.

5. In a rear sight for firearms, the combination with a lower base formed at its rear end with an upstanding shoulder containing a transverse screw-hole with a lateral opening in its forward wall, of an upperbase pivotally mounted upon the said lower base and provided at its rear edge with a' centrally arranged adjusting tongue entering the said screw-hole through the said lateral opening, two windage thumb-screws acting in opposition to each other upon the said tongue for the windage adjustment of the sight, and means coacting with the said screws for determining the adjusted positions thereof.

6. In a rear sight for firearms, the combination with the lower base thereof, of an upper base pivotally mounted thereupon, two windage-screws mounted in the base and arranged to act in opposition to each other upon opposite sides of the pivotal base.l and spring-actuating means for determining the adjusted positions of the said screws.

7. In a rear sight for firearms, the combination with the fixed base thereof, of a pivotal base mounted thereupon, two windage-screws mounted in the fixed base and arranged to act in opposition to each other upon the said pivotal base for the lateral adjustment thereof, and spring-actuated means for indicating the fractional turns of the screws and for holding them in their adjusted positions.

8. In a rear sight for firearms, the combination with the fixed base thereof, of a pivotal base mounted thereupon, two opposed windage-screws co-acting with the pivotal base for the lateral adjustment thereof, and two springs respectively applied to the said screws and traveling therewith and arranged to hold them in their adjusted positions.

9. In a rear sight for firearms, the combination with the fixed base thereof, of a pivotal base mounted thereupon, two windage-screws acting in opposition to each other upon the said pivotal base for the windage adjustment thereof, and two springs for the respective screws, each spring having an upwardly turned arm formed with an opening for the passage through it of its screw and adapted to enga-ge with the head of the screw for holding the screw in its adjusted position.

10. In a rear sight for. firearms, the combination with the fixed base thereof, of a pivotal base mounted thereupon, two windage-screws acting in opposition to each other upon the pivotal base for the windage adjustment thereof and each provided with a head having its inner face formed with notches, and two springs for the respective screws, each spring being formed with an uptnrned arm through which the screw passes and each arm being formed with a projection to enter the notches in the face of the head of its screw.

11. In a rear sight for firearms, the combination with the lower base thereof, of an upper base pivotally mounted thereupon, two windage-screws mounted in the said lower base and acting in opposition to each other upon the said upper base for the adjustment thereof, each screw having at its outer end a head the inner face of which is notched, and two sliding springs connected with the respective screws for traveling therewith, and each spring having an upturned arm through which its screw passes, the said arm standing at an angle to the body of the spring and adapted to engage with the notches in the head of its screw.

12. In a rear sight for firearms, the combination with theJ lower base thereof, of an upper base pivotally mounted, thereupon, two windage-screws mounted in the said lower base and acting in opposition to each other in laterally adjusting the said upper base and each having at its outer end a head the inner face of which is notched, and two springs having a flat member sliding in the fixed base and an upturned arm formed with an opening for the passage of its screw and with a projection entering the notches in the head thereof.

13. In a rear sight for firearms, the combination with a lower base formed at its rear end with a shoulder having an over-hanging forward edge and with a. transverse screwhole located beneath the said over-hanging edge and laterally cut away throughout its length, of an upper base pivotally mounted upon the said lower base and provided at its rear end with a tongue extending under the said over-hanging edge into the said screwhole through the said lateral opening therein, and two opposed windage-screws entered into the opposite ends of the said screw-hole and engaging with the opposite sides of the said tongues for the adjustment of the pivotal base.

14. In a rear sight for firearms, the combination with the lower base thereof, of an upper base pivotally mounted thereupon, a sight-leaf pivotally mounted upon the rear end of the said upper base and formed in the upper portion of its left hand edge with a long narrow slot, a slide mounted upon the said sight-leaf and having` a sight-opening, an elevation screw located between the front and rear faces of the said leaf coacting with the said slide for raising and lowering the same and provided at its upper end with a notched head, and a spring located in the said slot and engaging at its upper end with the notches of the said head for controlling and turning of the screw.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

FRANK F. BURTON. ALBERT F. LAUDENSACK.

Witnesses:

DANIEL I-I. VEADER, ERIK S. PALMER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. U. 

